High-pressure steam boiler for locomotives



Match 16 1926. 1,576,807 v J. BucHLl HIGH PRESSURE STEAM BOILER FOR LOCOKOTIVES Filed June 29, 1925 2 Sheets-Sheet l March 16 1926.

J.BUCHLI HIGH PRESSURE STEAM BOILER FOR LOCOMOTIVES 2 sneeis-sneet 2 Filed June 29, 1925 oooooooooooo Patented Mar. 16, i925.

UNlTED STATES JACOB BUCHLI, OF WINTERTHUR7 SWITZERLAND.

HIGH-renewals :STEAM BOILERKFQR LOCOMQTWES.

Application 'filed June 29, 1.925.

fo (/,ZZ whom. t may conce/m.'

Be it known that I, Jiioo BUoHLr, a citizen of the Swiss Republic, residing at Winterthur, Switzerland, have invented an Improvement in High-Pressure Steam Boilers.

for Locomotives, of which the following description, in connection with the accompanying drawings, is a specification, like c haracters on the-drawings representing like parts.

The present `inveifition relates to highpressure steam .boilers for locomotives.

4lt is known that with the use -ef high pressure steam the transformation into mechanical work is the more favorable the higher the pressure in the boiler As high pressure steam cannot be used with the ordinary ti-reboX 'of a locomotive and the known bracing of the shell thereof by vstay bolts, other means had to be devised to permit the use of high pressure steam. y

The present invention provides for a design of locomotive boilersallowing to use high pressure steam with locomotives. The working of the locomotive stipulates that large quantities of energy must be stored in the boiler and besides the large water space it is essential that .the water evapoi'ates quickly. In order to satisfy the latter condition the roof and the side walls of the iirebox are formed by water tubes arranged beside each other and flooded bythe combustion gases. The particular design and arrangement of these tubes form the subject matter of the present invention.

Constructional examples of the subject matter of the present invention are illustrated on the accompanying drawings, in which-- Fig. l is a cross-section through the lirebox and the upper boilers or steam drums;

Fig. 2 is a longitudinal section along line itl-ll in Fig. l through the lirebox and part of one steam drum;

Fig. 3 shows a section along line III-III in Fig. l;

Fig. 4 shows on a reduced scale a normal water` tube element;

Fig. 5 shows on a reduced scale a modified type of a water tube element;

Fig. G shows a portion of the upper boilers in a section along line VI-VI in Fig. l;

Fig. 7 is an elevation of the complete locomotive;

Fig. 8 is a vertical section along linel vnl-vnr in rig. s,

Serial No. 40,299..

Fig. 9 shows .a meditied type ot boiler having only one steam drum. Y

Referringv now lto the drawings 4l and l are the two upper boilers (steam collectors) into which the water tube lelements 2 are beaded. As is shown in Figs. l or 5, the tube elements consist of the tube Q of U-shape provided with a short branch 3. lhe extensions el of the tube 2 are .of a smaller diameter than the tubs '2 (approxi mately the diameter) and are'bent back and extend outside of and parallel V to the shanks of the U-shape, VThe branch and the free ends of the-extensions l are parallel to each other sothkat they can be introduced into corresponding holes of the drums l, l and beaded therein. -The insertion of the ytube elements into the drums 1,41 is carried out alternately, e. the'branches 3 are alternately joined t0 the .drain-S l ,and l whilst the free ends of theextensions el are' fined lone end in the drum land the other end in the drum l. For instance branch 3 Of 01.1.@ 0f the tube elements is c011- nected to the drum l and the branch 3 of the adjacent element 'is connected to the drum l. This manner oftixing the tube elements is illustrated lin Fig. 6, in which the lrows of holes 5 and 5 serve for lining the free ends of they extensions l'while for iiistance the branches 3 of the even tube elements are beaded in the row of holes 6. in the drum l andthe branches 3 of the uneven tube elements are beaded inthe row of holes 7 of the drum l. The Shanks of the tube elements in the middle portion of the firebox are inclined against the vertical direction and at the ends of the lirebox these shanks are vertical as shown atv 2 in Figs. 3 and 8. y

The extensions Il of the Water-tubev elements are protected by the Shanks 2 against the radiating heat of the lire, the beading places are protected in the same manner. The lower ends of the tube elements are enclosed in a frame 9 and embedded in an insulating material so that they can freely eX- pand. The drums or steam collectors l, l

and tube ele-ments 2 are protected on their outer side with insulating material l() and are enclosed with sheet iron ll, the insulating material being omitted in Fig. 3. The front wall of the iirebox is formed by a wall 12 of refractory material in which the opening 13 for the fire door is provided. l

As is shown in Fig. 5 the top part of the H." nl) range the branch o bubbles in the tube.

The `general arrangement of a high-pressure steam locomotive is illustrated in Fig. 7, which shows in dotted lines the tube eiements arranged in the Firebox.

Instead of two drums or steam collectors only one steam collector may be provided as is illustrated in Fig. 9 in whioh Case the branches 3 and Jfree ends of the extensions et ot every tube element are beaded to the drum l.

I claim:

1. In a high-pressure steam boiler for locomotives, a water tube of substantiall)y inverted U-shape` tor spanning the Ytire box and having` an extension to its shanks bent substantialy parallel to and protected by the shanks and a short tubular branch on said tube between the Shanks.

Q. In a high-pressure steam boiler for locomotives. a water tube of substantially inverted U-shape spanning` the tire box and having an extension of each shank of smaller diameter and bent substantially paralelto and protected by its shank, and a tubular branch on said tube between its shanks.

3. A high pressure steam boiler for locomotives comprising,` in combination tvo upper boilers, a plurality ot water tubes arranged beside each other in the longitudinal direction of the locomotive boiler and forming` between them a vaulted fire box, said water tubes consisting ot U-shaped tube elements the shanks ot' which haveextensions near the highest point ot that part to prevent acollection orn steam ot' a reduced diameter and bent in the outward and upward direction and substantially parallel to said shanks, and a branch provided on everyv water tube intermediate ot' its Shanks, said branch and the tree ends of said extensions being parallel to each other and one ot said free ends beingbeaded into one or" said upper boilers and the other ot' said free ends being beaded into the other of said upper boilers and said branches being alternately 'beaded to one or the other ot' said upper boilers.

t. A high pressure steam boiler tor locomotives comprising in combination two up per boilers, a plurality ot water tubes arranged beside each other in the longitudinal direction oi the locomotive boiler and tornim ing' between them a vaulted tire box, said water tubes consisting ot 'L1-shaped tube elements with an inclined middle portion, the Shanks' ot' which have extensions of a reduced diameter and bent in the outward and upward direction and substantially parallel to said Shanks, and a branch provided on every tube intermediate ot' its Shanks and at the highest point of said intermediate portion to prevent an accumulation of steam bubbles, said branch and the free ends of said extensions being,` paralel 'to each other and one of said free ends being' beaded into one of said upper boilers and the other et said tree ends being beaded into the other ot' saidupper boilers and said branches being alternately beaded to one or the other ot said upper boilers.

In testimony whereof, I have signed my name to this speciiication.

.moon Boor-rm. 

